Funding & Acknowledgements

The data used in this analysis is from the Export Standardized Tables in the SEACAR Data Discovery Interface (DDI). Documents and information available through the SEACAR DDI are owned by the data provider(s) and users are expected to provide appropriate credit following accepted citation formats. Users are encouraged to access data to maximize utilization of gained knowledge, reducing redundant research and facilitating partnerships and scientific innovation.

With respect to documents and information available from SEACAR DDI, neither the State of Florida nor the Florida Department of Environmental Protection makes any warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose arising out of the use or inability to use the data, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights.

This report was funded in part, through a grant agreement from the Florida Department of Environmental Protection, Florida Coastal Management Program, by a grant provided by the Office for Coastal Management under the Coastal Zone Management Act of 1972, as amended, National Oceanic and Atmospheric Administration. The views, statements, findings, conclusions and recommendations expressed herein are those of the author(s) and do not necessarily reflect the views of the State of Florida, NOAA or any of their sub agencies.

Published: 2025-05-22

Threshold Filtering

Threshold filters, following the guidance of Florida Department of Environmental Protection’s (FDEP) Division of Environmental Assessment and Restoration (DEAR) are used to exclude specific results values from the SEACAR Analysis. Based on the threshold filters, Quality Assurance / Quality Control (QAQC) Flags are inserted into the SEACAR_QAQCFlagCode and SEACAR_QAQC_Description columns of the export data. The Include column indicates whether the QAQC Flag will also indicate that data are excluded from analysis. No data are excluded from the data export, but the analysis scripts can use the Include column to exclude data (1 to include, 0 to exclude).

Continuous Water Quality threshold values
Parameter Name Units Low Threshold High Threshold
Dissolved Oxygen mg/L -0.000001 50
Dissolved Oxygen Saturation % -0.000001 500
Salinity ppt -0.000001 70
Turbidity NTU -0.000001 4000
Water Temperature Degrees C -5.000000 45
pH None 2.000000 14
Discrete Water Quality threshold values
Parameter Name Units Low Threshold High Threshold
Ammonia, Un-ionized (NH3) mg/L - -
Ammonium, Filtered (NH4) mg/L - -
Chlorophyll a, Corrected for Pheophytin ug/L - -
Chlorophyll a, Uncorrected for Pheophytin ug/L - -
Colored Dissolved Organic Matter PCU - -
Dissolved Oxygen mg/L -0.000001 25
Dissolved Oxygen Saturation % -0.000001 310
Fluorescent Dissolved Organic Matter QSE - -
Light Extinction Coefficient m^-1 - -
NO2+3, Filtered mg/L - -
Nitrate (NO3) mg/L - -
Nitrite (NO2) mg/L - -
Nitrogen, organic mg/L - -
Phosphate, Filtered (PO4) mg/L - -
Salinity ppt -0.000001 70
Secchi Depth m 0.000001 50
Specific Conductivity mS/cm 0.005000 100
Total Kjeldahl Nitrogen mg/L - -
Total Nitrogen mg/L - -
Total Nitrogen mg/L - -
Total Phosphorus mg/L - -
Total Suspended Solids mg/L - -
Turbidity NTU - -
Water Temperature Degrees C 3.000000 40
pH None 2.000000 13
Quality Assurance Flags inserted based on threshold checks listed in Table 1 and 2
SEACAR QAQC Description Include SEACAR QAQCFlagCode
Exceeds maximum threshold 0 2Q
Below minimum threshold 0 4Q
Within threshold tolerance 1 6Q
No defined thresholds for this parameter 1 7Q

Value Qualifiers

Value qualifier codes included within the data are used to exclude certain results from the analysis. The data are retained in the data export files, but the analysis uses the Include column to filter the results.

STORET and WIN value qualifier codes

Value qualifier codes from STORET and WIN data are examined with the database and used to populate the Include column in data exports.

Value Qualifier codes excluded from analysis
Qualifier Source Value Qualifier Include MDL Description
STORET-WIN H 0 0 Value based on field kit determination; results may not be accurate
STORET-WIN J 0 0 Estimated value
STORET-WIN V 0 0 Analyte was detected at or above method detection limit
STORET-WIN Y 0 0

Discrete Water Quality Value Qualifiers

The following value qualifiers are highlighted in the Discrete Water Quality section of this report. An exception is made for Program 476 - Charlotte Harbor Estuaries Volunteer Water Quality Monitoring Network and data flagged with Value Qualifier H are included for this program only.

H - Value based on field kit determiniation; results may not be accurate. This code shall be used if a field screening test (e.g., field gas chromatograph data, immunoassay, or vendor-supplied field kit) was used to generate the value and the field kit or method has not been recognized by the Department as equivalent to laboratory methods.

I - The reported value is greater than or equal to the laboratory method detection limit but less than the laboratory practical quantitation limit.

Q - Sample held beyond the accepted holding time. This code shall be used if the value is derived from a sample that was prepared or analyzed after the approved holding time restrictions for sample preparation or analysis.

S - Secchi disk visible to bottom of waterbody. The value reported is the depth of the waterbody at the location of the Secchi disk measurement.

U - Indicates that the compound was analyzed for but not detected. This symbol shall be used to indicate that the specified component was not detected. The value associated with the qualifier shall be the laboratory method detection limit. Unless requested by the client, less than the method detection limit values shall not be reported

Systemwide Monitoring Program (SWMP) value qualifier codes

Value qualifier codes from the SWMP continuous program are examined with the database and used to populate the Include column in data exports. SWMP Qualifier Codes are indicated by QualifierSource=SWMP.

SWMP Value Qualifier codes
Qualifier Source Value Qualifier Include Description
SWMP -1 1 Optional parameter not collected
SWMP -2 0 Missing data
SWMP -3 0 Data rejected due to QA/QC
SWMP -4 0 Outside low sensor range
SWMP -5 0 Outside high sensor range
SWMP 0 1 Passed initial QA/QC checks
SWMP 1 0 Suspect data
SWMP 2 1 Reserved for future use
SWMP 3 1
SWMP 4 1 Historical: Pre-auto QA/QC
SWMP 5 1 Corrected data

Water Column

The water column habitat extends from the water’s surface to the bottom sediments, and it’s where fish, dolphins, crabs and people swim! So much life makes its home in the water column that the health of marine and coastal ecosystems, as well as human economies, depend on the condition of this vulnerable habitat. Local patterns of rainfall, temperature, winds and currents can rapidly change the condition of the water column, while global influences such as El Niño/La Niña, large-scale fluctuation in sea temperatures and climate change can have long-term effects. Inputs from the prosperity of our day-to-day lives including farming, mining and forestry, and emissions from power generation, automobiles and water treatment can also alter the health of the water column. Acting alone or together, each input can have complex and lasting effects on habitats and ecosystems.


SEACAR evaluates water column health with several essential parameters. These include nutrient surveys of nitrogen and phosphorus, and water quality assessments of salinity, dissolved oxygen, pH, and water temperature. Water clarity is evaluated with Secchi depth, turbidity, levels of chlorophyll a, total suspended solids, and colored dissolved organic matter. Additionally, the richness of nekton is indicated by the abundance of free-swimming fishes and macroinvertebrates like crabs and shrimps.

Seasonal Kendall-Tau Analysis

Indicators must have a minimum of five to ten years, depending on the habitat, of data within the geographic range of the analysis to be included in the analysis. Ten years of data are required for discrete parameters, and five years of data are required for continuous parameters. If there are insufficient years of data, the number of years of data available will be noted and labeled as “insufficient data to conduct analysis”. Further, for the preferred Seasonal Kendall-Tau test, there must be data from at least two months in common across at least two consecutive years within the RCP managed area being analyzed. Values that pass both of these tests will be included in the analysis and be labeled as Use_In_Analysis = TRUE. Any that fail either test will be excluded from the analyses and labeled as Use_In_Analysis = FALSE. The points for all Water Column plots displayed in this section are monthly averages. Trend significance will be denoted as “Significant Trend” (when p < 0.05), or “Non-significant Trend” (when p >= 0.05). Any parameters with insufficient data to perform Seasonal Kendall-Tau test will have their monthly averages plotted without a corresponding trend line.

Water Quality - Discrete

The following files were used in the discrete analysis:

  • Combined_WQ_WC_NUT_Chlorophyll_a_corrected_for_pheophytin-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Chlorophyll_a_uncorrected_for_pheophytin-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Colored_dissolved_organic_matter_CDOM-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Dissolved_Oxygen-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Dissolved_Oxygen_Saturation-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_pH-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Salinity-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Secchi_Depth-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Total_Nitrogen-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Total_Phosphorus-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Total_Suspended_Solids_TSS-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Turbidity-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_Water_Temperature-2025-Mar-06.txt

Chlorophyll a, Corrected for Pheophytin - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average levels of chlorophyll a, corrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Scatter plot of monthly average levels of chlorophyll a, corrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Seasonal Kendall-Tau Trend Analysis for Chlorophyll a, Corrected for Pheophytin
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Lab Significantly increasing trend 7993 23 2002 - 2024 4.7 0.2968 3.7011 0.1813 0

Monthly average chlorophyll a, corrected for pheophytin, increased by 0.18 µg/L per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Chlorophyll a, Corrected for Pheophytin
ProgramID N_Data YearMin YearMax
4054 6918 2002 2024
5002 858 2002 2024
5014 663 2017 2024

Program names:

4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Chlorophyll a, Uncorrected for Pheophytin - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average levels of chlorophyll a, uncorrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Scatter plot of monthly average levels of chlorophyll a, uncorrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Seasonal Kendall-Tau Trend Analysis for Chlorophyll a, Uncorrected for Pheophytin
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Lab Significantly increasing trend 6317 23 2002 - 2024 6.2 0.2539 5.3821 0.1943 0

Monthly average chlorophyll a, uncorrected for pheophytin, increased by 0.19 µg/L per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Chlorophyll a, Uncorrected for Pheophytin
ProgramID N_Data YearMin YearMax
4054 5583 2002 2024
5014 723 2017 2024
5002 405 2008 2024
103 118 2020 2021
118 3 2006 2010
95 1 2012 2012

Program names:

95 - Harmful Algal Bloom Marine Observation Network4
103 - EPA STOrage and RETrieval Data Warehouse (STORET)/WQX5
118 - National Aquatic Resource Surveys, National Coastal Condition Assessment6
4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Colored Dissolved Organic Matter - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average colored dissolved organic matter (CDOM) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed CDOM (triangles) is included in the plot.
Scatter plot of monthly average colored dissolved organic matter (CDOM) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed CDOM (triangles) is included in the plot.
Seasonal Kendall-Tau Trend Analysis for Colored Dissolved Organic Matter
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Lab Significantly decreasing trend 1826 12 2007 - 2024 33.4 -0.1898 46.7298 -1.0173 0.0064

Monthly average colored dissolved organic matter decreased by 1.02 PCU per year, indicating an increase in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Colored Dissolved Organic Matter
ProgramID N_Data YearMin YearMax
4054 1510 2007 2024
5002 317 2020 2024
5014 7 2018 2018

Program names:

4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Dissolved Oxygen - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average dissolved oxygen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen values measured in the field (circles) are included in the plot.
Scatter plot of monthly average dissolved oxygen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen values measured in the field (circles) are included in the plot.
Seasonal Kendall-Tau Trend Analysis for Dissolved Oxygen
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Field Significantly decreasing trend 22400 30 1995 - 2024 5.99 -0.1693 6.2392 -0.0271 0

Monthly average dissolved oxygen decreased by 0.03 mg/L per year.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Dissolved Oxygen
ProgramID N_Data YearMin YearMax
5002 18140 1995 2024
4054 3488 2002 2024
95 400 2007 2018
5014 260 2017 2022
69 185 2001 2010
103 168 2020 2021
118 2 2006 2015

Program names:

69 - Fisheries-Independent Monitoring (FIM) Program7
95 - Harmful Algal Bloom Marine Observation Network4
103 - EPA STOrage and RETrieval Data Warehouse (STORET)/WQX5
118 - National Aquatic Resource Surveys, National Coastal Condition Assessment6
4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Dissolved Oxygen Saturation - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average dissolved oxygen saturation over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen saturation values measured in the field (circles) are included in the plot.
Scatter plot of monthly average dissolved oxygen saturation over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen saturation values measured in the field (circles) are included in the plot.
Seasonal Kendall-Tau Trend Analysis for Dissolved Oxygen Saturation
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Field No significant trend 2351 23 1999 - 2024 81.2 0.0857 79.2681 0.1984 0.1062

Dissolved oxygen saturation showed no detectable trend between 1999 and 2024.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Dissolved Oxygen Saturation
ProgramID N_Data YearMin YearMax
5002 2108 1999 2024
5014 238 2017 2022
4054 48 2021 2023
95 3 2012 2013

Program names:

95 - Harmful Algal Bloom Marine Observation Network4
4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

pH - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average pH over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only pH values measured in the field (circles) are included in the plot.
Scatter plot of monthly average pH over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only pH values measured in the field (circles) are included in the plot.
Seasonal Kendall-Tau Trend Analysis for pH
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Field Significantly decreasing trend 18686 30 1995 - 2024 7.8 -0.3898 7.8739 -0.0154 0

Monthly average pH decreased by 0.02 pH units per year.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for pH
ProgramID N_Data YearMin YearMax
5002 14757 1995 2024
4054 3526 2002 2024
95 401 2007 2018
5014 267 2017 2022
69 190 2001 2010
103 168 2020 2021

Program names:

69 - Fisheries-Independent Monitoring (FIM) Program7
95 - Harmful Algal Bloom Marine Observation Network4
103 - EPA STOrage and RETrieval Data Warehouse (STORET)/WQX5
4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Salinity - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average salinity over time. If the time series included ten or more years of discrete observations, significant (blue) or non-significant (magenta) trend lines are also shown. Discrete salinity values derived from grab samples analyzed in the field (circles) or the laboratory (triangles) are both included in the plot.
Scatter plot of monthly average salinity over time. If the time series included ten or more years of discrete observations, significant (blue) or non-significant (magenta) trend lines are also shown. Discrete salinity values derived from grab samples analyzed in the field (circles) or the laboratory (triangles) are both included in the plot.
Seasonal Kendall-Tau Trend Analysis for Salinity
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
All Significantly decreasing trend 25641 31 1980 - 2024 31.71 -0.361 37.0041 -0.3235 0

Monthly average salinity decreased by 0.32 ppt per year.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Salinity
ProgramID N_Data YearMin YearMax
5002 20802 1995 2024
4054 4101 2002 2024
95 563 1980 2018
5014 267 2017 2022
69 190 2001 2010
118 2 2015 2015

Program names:

69 - Fisheries-Independent Monitoring (FIM) Program7
95 - Harmful Algal Bloom Marine Observation Network4
118 - National Aquatic Resource Surveys, National Coastal Condition Assessment6
4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Secchi Depth - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average Secchi depth over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Secchi depth is only measured in the field (circles).
Scatter plot of monthly average Secchi depth over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Secchi depth is only measured in the field (circles).
Seasonal Kendall-Tau Trend Analysis for Secchi Depth
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Field Significantly increasing trend 2870 25 1999 - 2024 -0.8 0.0964 -0.8686 0.0039 0.0436

Monthly average Secchi depth became shallower by less than 0.01 m per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Secchi Depth
ProgramID N_Data YearMin YearMax
5002 1423 1999 2024
4054 937 2002 2014
5014 228 2017 2022
69 190 2001 2010
103 93 2020 2021

Program names:

69 - Fisheries-Independent Monitoring (FIM) Program7
103 - EPA STOrage and RETrieval Data Warehouse (STORET)/WQX5
4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Total Nitrogen - Discrete

Total Nitrogen Calculation:

The logic for calculated Total Nitrogen was provided by Kevin O’Donnell and colleagues at FDEP (with the help of Jay Silvanima, Watershed Monitoring Section). The following logic is used, in this order, based on the availability of specific nitrogen components.

  1. TN = TKN + NO3O2;
  2. TN = TKN + NO3 + NO2;
  3. TN = ORGN + NH4 + NO3O2;
  4. TN = ORGN + NH4 + NO2 + NO3;
  5. TN = TKN + NO3;
  6. TN = ORGN + NH4 + NO3;

Additional Information:

  • Rules for use of sample fraction:
    • Florida Department of Environmental Protection (FDEP) report that if both “Total” and “Dissolved” components are reported, only “Total” is used. If the total is not reported, then the dissolved components are used as a best available replacement.
    • Total nitrogen calculations are done using nitrogen components with the same sample fraction, nitrogen components with mixed total/dissolved sample fractions are not used. In other words, total nitrogen can be calculated when TKN and NO3O2 are both total sample fractions, or when both are dissolved sample fractions. Future calculations of total nitrogen values may be based on components with mixed sample fractions.
  • Values inserted into data:
    • ParameterName = “Total Nitrogen”
    • SEACAR_QAQCFlagCode = “1Q”
    • SEACAR_QAQC_Description = “SEACAR Calculated”

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average total nitrogen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only nitrogen values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total nitrogen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only nitrogen values obtained from laboratory analyses (triangles) are included in the plot.
Seasonal Kendall-Tau Trend Analysis for Total Nitrogen
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Lab No significant trend 5960 28 1997 - 2024 0.5545 0.0705 0.5782 0.0026 0.0751

Total nitrogen showed no detectable trend between 1997 and 2024.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Total Nitrogen
ProgramID N_Data YearMin YearMax
4054 3227 2002 2024
5002 2378 1997 2024
5014 537 2017 2022

Program names:

4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Total Phosphorus - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average total phosphorus over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only phosphorus values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total phosphorus over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only phosphorus values obtained from laboratory analyses (triangles) are included in the plot.
Seasonal Kendall-Tau Trend Analysis for Total Phosphorus
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Lab Significantly decreasing trend 9346 28 1997 - 2024 0.072 -0.2044 0.0853 -0.0007 0

Monthly average total phosphorus decreased by less than 0.01 mg/L per year.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Total Phosphorus
ProgramID N_Data YearMin YearMax
4054 5381 2002 2024
5002 3571 1997 2024
5014 664 2017 2024
103 59 2020 2021

Program names:

103 - EPA STOrage and RETrieval Data Warehouse (STORET)/WQX5
4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Total Suspended Solids - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average total suspended solids (TSS) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only TSS values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total suspended solids (TSS) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only TSS values obtained from laboratory analyses (triangles) are included in the plot.
Seasonal Kendall-Tau Trend Analysis for Total Suspended Solids
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Lab Significantly decreasing trend 4982 28 1997 - 2024 17 -0.3961 29.932 -0.6692 0

Monthly average total suspended solids decreased by 0.67 mg/L per year, indicating an increase in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Total Suspended Solids
ProgramID N_Data YearMin YearMax
4054 4624 2002 2024
5002 2472 1997 2024
5014 126 2018 2022
103 60 2020 2021

Program names:

103 - EPA STOrage and RETrieval Data Warehouse (STORET)/WQX5
4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Turbidity - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average turbidity over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only turbidity values measured in the laboratory (triangles) are included in the plot.
Scatter plot of monthly average turbidity over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only turbidity values measured in the laboratory (triangles) are included in the plot.
Seasonal Kendall-Tau Trend Analysis for Turbidity
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Lab Significantly increasing trend 14793 30 1995 - 2024 4.5 0.2265 4.8593 0.0878 0

Monthly average turbidity increased by 0.09 NTU per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Turbidity
ProgramID N_Data YearMin YearMax
5002 14596 1995 2024
4054 2683 2002 2021
5014 126 2018 2022
103 59 2020 2021
95 4 2012 2012

Program names:

95 - Harmful Algal Bloom Marine Observation Network4
103 - EPA STOrage and RETrieval Data Warehouse (STORET)/WQX5
4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Water Temperature - Discrete

Seasonal Kendall-Tau Trend Analysis

Scatter plot of monthly average water temperature over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only water temperature measurements taken in the field (circles) are included in the plot.
Scatter plot of monthly average water temperature over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only water temperature measurements taken in the field (circles) are included in the plot.
Seasonal Kendall-Tau Trend Analysis for Water Temperature
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
Field Significantly increasing trend 25291 30 1995 - 2024 23.3 0.2137 22.3793 0.0505 0

Monthly average water temperature increased by 0.05°C per year.

Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Programs contributing data for Water Temperature
ProgramID N_Data YearMin YearMax
5002 21298 1995 2024
4054 3601 2002 2024
95 534 2007 2018
5014 267 2017 2022
69 190 2001 2010
103 168 2020 2021

Program names:

69 - Fisheries-Independent Monitoring (FIM) Program7
95 - Harmful Algal Bloom Marine Observation Network4
103 - EPA STOrage and RETrieval Data Warehouse (STORET)/WQX5
4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5002 - Florida STORET / WIN2
5014 - Guana River and Guana Lake Water Quality Monitoring3

Water Quality - Continuous

The following files were used in the continuous analysis:

  • Combined_WQ_WC_NUT_cont_Dissolved_Oxygen_NE-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_cont_Dissolved_Oxygen_Saturation_NE-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_cont_pH_NE-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_cont_Salinity_NE-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_cont_Turbidity_NE-2025-Mar-06.txt

  • Combined_WQ_WC_NUT_cont_Water_Temperature_NE-2025-Mar-06.txt

Continuous monitoring locations in Guana Tolomato Matanzas National Estuarine Research Reserve

Station overview for Continuous parameters by Program
ProgramID ProgramLocationID Years of Data Use in Analysis Parameters
4054 gtmfmwq 25 TRUE DO , DOS , pH , Sal , Turb , TempW
4054 gtmpcwq 25 TRUE DO , DOS , pH , Sal , Turb , TempW
4054 gtmpiwq 24 TRUE Sal , TempW
4054 gtmpiwq 25 TRUE DO , DOS , pH , Turb
4054 gtmsswq 24 TRUE DO , DOS , pH , Sal , Turb , TempW
5062 872-0494 2 FALSE Sal , TempW

Program names:

4054 - Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program1
5062 - FDEP Bureau of Survey and Mapping Continuous Water Quality Program8

Map showing continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. Sites marked as Use In Analysis (green) are featured in this report.
Map showing continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. Sites marked as Use In Analysis (green) are featured in this report.

Dissolved Oxygen - Continuous

Scatter plot of monthly average dissolved oxygen over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average dissolved oxygen over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for Dissolved Oxygen - All Stations
Station Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
gtmsswq Significantly increasing trend 661972 24 2002 - 2025 6.3 0.10 5.89 0.01 0.03
gtmpiwq Significantly decreasing trend 665008 25 2001 - 2025 5.9 -0.09 5.75 -0.01 0.04
gtmfmwq Significantly increasing trend 683159 25 2001 - 2025 6.5 0.10 6.27 0.00 0.02
gtmpcwq No significant trend 703770 25 2001 - 2025 5.5 0.04 5.23 0.00 0.33

At two program locations, monthly average dissolved oxygen increased by less than 0.01 mg/L per year at one site and by 0.01 mg/L per year at the other. At one program location, monthly average dissolved oxygen decreased by 0.01 mg/L per year. No detectable change in monthly average dissolved oxygen was observed at one location.

Map showing location of dissolved oxygen continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of dissolved oxygen continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Dissolved Oxygen Saturation - Continuous

Scatter plot of monthly average dissolved oxygen saturation over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average dissolved oxygen saturation over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for Dissolved Oxygen Saturation - All Stations
Station Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
gtmpiwq Significantly decreasing trend 670820 25 2001 - 2025 82.2 -0.18 82.04 -0.18 0.00
gtmsswq Significantly increasing trend 667908 24 2002 - 2025 89.5 0.15 84.22 0.12 0.00
gtmfmwq Significantly increasing trend 694826 25 2001 - 2025 92.6 0.15 89.33 0.09 0.00
gtmpcwq No significant trend 705263 25 2001 - 2025 71.4 0.00 68.37 0.00 0.97

At two program locations, monthly average dissolved oxygen saturation increased by 0.09% per year at one site and by 0.12% per year at the other. At one program location, monthly average dissolved oxygen saturation decreased by 0.18% per year. No detectable change in monthly average dissolved oxygen saturation was observed at one location.

Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

pH - Continuous

Scatter plot of monthly average pH over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average pH over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for pH - All Stations
Station Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
gtmsswq No significant trend 637677 24 2002 - 2025 7.9 0.02 7.84 0.00 0.55
gtmpiwq Significantly decreasing trend 661500 25 2001 - 2025 7.6 -0.17 7.61 0.00 0.00
gtmfmwq Significantly decreasing trend 668566 25 2001 - 2025 8.0 -0.15 7.99 0.00 0.00
gtmpcwq Significantly decreasing trend 696839 25 2001 - 2025 7.4 -0.12 7.45 -0.01 0.00

At three program locations, monthly average pH decreased between less than 0.01 and 0.01 pH units per year. No detectable change in monthly average pH was observed at one location.

Map showing location of ph continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of ph continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Salinity - Continuous

Scatter plot of monthly average salinity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average salinity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for Salinity - All Stations
Station Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
gtmsswq Significantly decreasing trend 646637 24 2002 - 2025 33.90 -0.12 34.14 -0.06 0
gtmpiwq Significantly decreasing trend 666468 24 2001 - 2024 27.90 -0.26 32.45 -0.33 0
gtmfmwq Significantly decreasing trend 671050 25 2001 - 2025 34.40 -0.17 34.89 -0.06 0
gtmpcwq Significantly decreasing trend 713330 25 2001 - 2025 16.60 -0.14 17.2 -0.23 0
872-0494 Insufficient data to calculate trend 34918 2 2020 - 2021 8.99 - - - -

At four program locations, monthly average salinity decreased between 0.06 and 0.33 ppt per year. There was insufficient data to fit a model for one location.

Map showing location of salinity continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of salinity continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Turbidity - Continuous

Scatter plot of monthly average turbidity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average turbidity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for Turbidity - All Stations
Station Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
gtmsswq No significant trend 633255 24 2002 - 2025 9 0.00 9.83 0.00 0.94
gtmpiwq Significantly decreasing trend 643280 25 2001 - 2025 10 -0.10 14.48 -0.07 0.02
gtmfmwq Significantly decreasing trend 680985 25 2001 - 2025 7 -0.11 9.19 -0.06 0.01
gtmpcwq Significantly decreasing trend 687902 25 2001 - 2025 9 -0.18 9.73 -0.11 0.00

At three program locations, monthly average turbidity decreased between 0.06 and 0.11 NTU per year. No detectable change in monthly average turbidity was observed at one location.

Map showing location of turbidity continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of turbidity continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature - Continuous

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for Water Temperature - All Stations
Station Statistical Trend Sample Count Years with Data Period of Record Median tau Sen Intercept Sen Slope p
gtmpcwq Significantly increasing trend 721896 25 2001 - 2025 24.30 0.15 23.8 0.04 0
gtmfmwq Significantly increasing trend 714709 25 2001 - 2025 23.70 0.23 23 0.05 0
gtmsswq Significantly increasing trend 680248 24 2002 - 2025 23.80 0.23 23 0.06 0
gtmpiwq Significantly increasing trend 716752 24 2001 - 2024 24.30 0.19 23.58 0.04 0
872-0494 Insufficient data to calculate trend 35473 2 2020 - 2021 22.34 - - - -

At four program locations, monthly average water temperature increased between 0.04 and 0.06°C per year. There was insufficient data to fit a model for one location.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Coastal Wetlands

The data file used is: All_CW_Parameters-2025-Mar-06.txt

Line graph of annual average coastal wetlands species richness over time for mangroves and associates (triangles), marsh (squares), and marsh succulents (circles). If the time series by species group included more than one year of observations, a line connects data points for visualization.
Line graph of annual average coastal wetlands species richness over time for mangroves and associates (triangles), marsh (squares), and marsh succulents (circles). If the time series by species group included more than one year of observations, a line connects data points for visualization.
Coastal Wetlands Species Richness
Species Group Sample Count Number of Years Period of Record Median N of Taxa Mean N of Taxa
Mangroves and associates 387 12 2012 - 2023 1 1.02
Marsh 2568 12 2012 - 2023 1 1.12
Marsh succulents 868 12 2012 - 2023 1 1.38

Between 2012 and 2023, the median annual number of species for mangroves and associates was 1 based on 387 observations. Between 2012 and 2023, the median annual number of species for marsh was 1 based on 2,568 observations. Between 2012 and 2023, the median annual number of species for marsh succulents was 1 based on 868 observations.

Map showing location of coastal wetlands sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of coastal wetlands sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Oyster

The data file used is: All_OYSTER_Parameters-2025-Apr-24.txt

Density

Natural

Scatter plot of oyster density over time. If the time series included five or more years with observations, an estimated trend (blue line) and a 95% credible interval (purple band) may also be plotted. Data points are jittered horizontally to reduce overlap.
Scatter plot of oyster density over time. If the time series included five or more years with observations, an estimated trend (blue line) and a 95% credible interval (purple band) may also be plotted. Data points are jittered horizontally to reduce overlap.
Model results for Oyster Density - Natural
Shell Type Habitat Type Trend Status Estimate Standard Error Credible Interval
Live Oysters Natural Significantly decreasing trend -128.2 481.29 -32.73 to -484.82

For natural reefs, density decreased by an average of 128.2 oysters per square meter per year.

Map showing location of oyster density sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of oyster density sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Percent Live

Natural

Scatter plot of percent live oysters over time. If the time series included five or more years with observations, an estimated trend (blue line) and a 95% credible interval (purple band) may also be plotted. Data points are jittered horizontally to reduce overlap.
Scatter plot of percent live oysters over time. If the time series included five or more years with observations, an estimated trend (blue line) and a 95% credible interval (purple band) may also be plotted. Data points are jittered horizontally to reduce overlap.
Model results for Oyster Percent Live - Natural
Shell Type Habitat Type Trend Status Estimate Standard Error Credible Interval
Live Oysters Natural Significantly decreasing trend -0.44 10.12 -0.13 to -0.6

For natural reefs, percent live cover decreased by an average of 0.44% per year.

Map showing location of oyster percent live sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of oyster percent live sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Shell Height

Natural

Model results for Oyster Shell Height - Natural
Shell Type SizeClass Habitat Type Trend Status Estimate Standard Error Credible Interval
Dead Oyster Shells >75mm Natural - - - -
Dead Oyster Shells 25-75mm Natural - - - -
Dead Oyster Shells Natural - - - -
Live Oysters >75mm Natural No significant change 0.56 0.37 -0.18 to 1.3
Live Oysters 25-75mm Natural No significant change 0.84 0.44 -0.03 to 1.69
Live Oysters Natural - - - -

For natural reefs, annual average live oyster shell height in the 25-75mm and ≥75mm size classes increased by 0.84mm per year and 0.56mm per year, respectively. Models are not run on dead oyster shell measurements.

Map showing location of oyster shell height sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of oyster shell height sampling locations within the boundaries of Guana Tolomato Matanzas National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

References

1.
Florida Department of Environmental Protection (DEP); Office of Resilience and Coastal Protection (RCP); Guana Tolomato Matanzas National Estuarine Research Reserve (GTMNERR); NOAA National Estuarine Research Reserve System (NERRS). Guana Tolomato Matanzas National Estuarine Research Reserve System-Wide Monitoring Program. (2024).
2.
Florida Department of Environmental Protection (DEP). Florida STORET / WIN. (2024).
3.
Florida Department of Environmental Protection (DEP); Office of Resilience and Coastal Protection (RCP); Guana Tolomato Matanzas National Estuarine Research Reserve (GTMNERR); Friends of GTM; Florida Fish and Wildlife Conservation Commission (FWC). Guana River and Guana Lake Water Quality Monitoring . (2024).
4.
Florida Fish and Wildlife Conservation Commission (FWC); Florida Fish and Wildlife Research Institute (FWRI). Harmful Algal Bloom Marine Observation Network. (2018).
5.
U.S. Environmental Protection Agency (EPA). EPA STOrage and RETrieval Data Warehouse (STORET)/WQX. (2023).
6.
U.S. Environmental Protection Agency (EPA); Office of Water; National Oceanic and Atmospheric Administration (NOAA); U.S. Geological Survey (USGS); U.S. Fish and Wildlife Service (USFWS); National Estuary Program (NEP); coastal states. National Aquatic Resource Surveys, National Coastal Condition Assessment. (2021).
7.
Florida Fish and Wildlife Conservation Commission (FWC). Fisheries-Independent Monitoring (FIM) Program. (2022).
8.
Florida Department of Environmental Protection (DEP); Division of State Lands; Bureau of Survey and Mapping. FDEP Bureau of Survey and Mapping Continuous Water Quality Program. (2021).